Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfb4be892a21f490…

MALICIOUS

PDF

72.0 KB Created: 2020-11-18 20:57:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 90b9eae5ba93656ab05fb94bc4254fb8 SHA-1: 9663596e99caa36eeca77e9020934f857e708313 SHA-256: cfb4be892a21f490f8354336d205570aede7c82e200458f1ffb70541eeebf15d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, including one to 'traffnew.ru', suggesting a redirection or download attempt. The document body, though heavily obfuscated, appears to contain product-related text, likely a lure to encourage clicks on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://traffnew.ru/123?utm_term=vortex+viper+hst+4-16x44+moa+reticle PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369323/normal_5f9c00a04e7a8.pdfIn PDF document text
    • https://gizojobov.weebly.com/uploads/1/3/4/4/134436228/7449095.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411273/normal_5f982afeec605.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366304/normal_5f875c755ccc3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0280c46c-3388-43d5-863a-15b730798963/glencoe_physical_science_chapter_4_test_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b40bdf5-c141-474f-84b7-7f1af838ed7c/um_montante_teremos_em_4_meses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e839aac8-bc14-4608-8dd0-557cee508323/706059193.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd7438cc-0b45-4a73-914f-add7b8e1f4b1/go_math_5th_grade_chapter_11.11_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b478a4b5-49c0-442c-bbf7-58cedf9f568b/37295178047.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d2e047d-22e0-4f2e-8dc7-072dc6d3586b/gamekit_gift_code_generator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1825f6c-8e4f-4a36-897a-7fd64071122c/muzafagezutunazitatiwej.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/what_is_the_sound_of_rainfall_called.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA3 5592 bytes
SHA-256: d84d5cbbefd09ec868daa37443a781178f2d0927a2be413403cd2066d5664dd8
font_01_sfnt_off0000ed96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED96 11044 bytes
SHA-256: 89f890fabe82583076f886f42fdc4ba95972808624b0e14c968d8c308852d4e3

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